A cobpobation



Feb. 2, 1932.

R. 1.'. HosKlNG BURR FORMING TOOL Filed Aug. 13, 1930 Patented lieb. 2,1932* entre Nrreo STATES PATENT? AoFF-'len RICHARD T. HOSRING, 0I'WILHETTE, ILLINOIS, BSIGNOR, IBY IESNE SSIGNIEN'IB, T0 BHAKEPROOF LOCKWASHER COMPANY, INCORPORATED, 0F GHICAGO, ILLINOIS,

A. @EPURATION 0F DELAWARE Application led August 13, 1930. Serial lo.474,901.

This invention is a tool for forming series of ratchet-like burrs orteeth in the opposite faces of a circular loop such as is commonlyformed in the end of a wire connector. The

tool may also be used for forming similar bnrrs in the opposite faces ofan `electric terminal washer made from dat metal.

Such burrs, when formed by this tool in the manner -to be presentlydescribed, are

l@ useful Ifor establishing better electrical contact between the loopterminal and its binding screw or nut, firstly, because in forming theburrs it turns up and exposes on them new surfaces of bri ht clean metalthat give more perfect electrical contact between the connector and thenutlor bolt by which it is clampedin service, secondly, because theburrsv made by this tool are of ratchet-like coniiguration and aredirectioned on the opposite E@ sides of the loop or connector so that anut, after bein tightened down upon them will, to a consi erable degree,resist tendency to turn in the' reverse direction. That is to say,either a round 'wire connector or a flat connector, after being burredby this tool possesses somewhat the to resistunscrewing.

The claimed invention is found vin the structure of the cutting dies, inthe means 3@ for actuating them to plow into the workpiece in thedesired manner, in the adjustable device for holdingwork-pieces ofdifferent sizes in properly centered position beproperty of a nut locktween the dies, in the device for preventing the shank of thework-piece'y from bein displaced while the dies are cutting, and 1n aneqnalizing device that "interconnects the two dies and constrains themto operate with opposite and equal embedding and tooth-- a@ plowingmovements when engaged in the worin n l By way of illustration I shallldescribe the invention as embodied in a hand-operated tool having theeneral appearance of pliers, although it will apparent vthat the pair of-opposed burr-cutting dies, constituting the essential feature, may beactuated by powerdriven gears in known manner instead of by the manuallyoperated lier handles herein shown, without departing from my pinvention as set forth incertain of 'the thereof.

In the drawings Figil is a plan view of a wire loop with projections ascut by the tool.

Fig; 2 is a part sectional edge view on line 2-2 of Fi 1, showing theprojections diagrammatical y.

Fig. 3 is a plan view of a terminal formed from wire or stamped fromfiat stock and toothed by this tool;

c Fig. 4 1s a side view of the tool with the work piece in place.A

F 5 is a bottom view of the parte Shown in F 1g. 4.

Fi 6 is a section on line 6 6 of Figs. 4 an 7, showing the yoke, withthe dies and handles omitted.

Fig. 7 is a detail of the work-centering and holdmg device.

The hand tool selected for illustration consists primarily in a frame.member or yoke l having two aws 2, 3 spaced apart and bored to provideguldewayswlthin which are dies 1,A 5 slidable and bored co-axially,their opposing end surfaces each Ihaving an annular ring or circle ofratchet teeth 4a, 5a cut thereine The inclined facets 6 of theindividual teeth are oppositely directed on the two dies, for purposesthatwill presently appear.

Actuating means is provided for forcing these two dies to approach eachother and to simultaneously embed ltheir ,teeth Into "the opposite facesof the loo terminal or similar work-piece 7 located etween them.

The two dies, during their endwise approach, are given slight rotarymovements,

simultaneously in opposite directions, so that the resultant combinedembedding and plowing operations raise up or swa e two annular series oftooth-like burrs 7a, 7 ont of the 0pposite faces of the work-piece.

Each die has an external feeding-in thread 46, 56 that meshes with acorresponding internal thread inthe bore of the corresponding jaw.

them both to 4yoke is appropriate to produce that relationship betweenthe turning movements of the dies and their approach movement whichresults in imparting to the hurrs 7a, 7 b the correct shape and size.

ln the hand-operated type oi tool each die is provided with an actuatinghandle 8, 9 se'- cured to its punch hy a set screw 10,11. rllhe handlesare apropriately shaped to apt p e held in one hand.

en the handles 8, 9 are squeezed togather from the osition shown in Fig.5 the dies are turned t rough equal small angles in opposite directionsand their ratchet tth bite into the work.

For positively holding the wire loop or terminal central with the axialline y, oir the dies, a lll-notched plate12 nged at 12a is fastened. hymeans of a screw 13, to the yoke 1. Flange 12a is slotted at 12h toreceive the screw 13, permittin sucient adjustment of the V-notch of pate 12 toward and away from the axial line y, y to appropriately centerdierent sizes ci loops or terminals, v

For holdin the loop or terminal against movement wiewise that is to sayin alined relationship with the tool as a whole while the dies areperforming their work, and thereby insuring that the ltant teethshall heof the same size 'and sha on hoth sides of the work-piece, there isvassociated with plate l2 and its Harige 12a a troughed guide 12o inwhich the shank is held, as shown in i' l and 5.

t vcapitalizing device is also carried hy plate 12 to insure syetricalapproaching and recedin movements oi the two handles 8, 9 and of t edies t, 5. The equalizer consists of a longitudinali #nl arm 14 integralwith plate l2 and aving a slidin block 15 and a retracting spring 16.Bloc provided with an aperture 15a, in which is received the ivot pin 17of a joint that unites a pair of lin s 18, 19. Y'.lhe links are pivotedat their outer ends to the handles 8, 9. This mechanism'equalizes theturn i motion of the two dies and equalizes their ongit'udinal ap roachmovements as well.

en the set screws 10 and 1l are released the' dies ma he set by means ofa wrench applied to t e squared ends 4c, 5c with their cutting teeth ata distance a art suitable to accommodate the thickness o the work. .y Toadapt the tool for rapid production of toothed loops or to the making ofheavy work, it is only necessaryv tov substitute gears or otheruwer-actuated die=rotating elements instea of the handles, which can hedone without departing from my `invention as herein claimed. :rf 1

f By the means ahove described I have produced .a simple, relativelyinexpensieA tool` which, hand operatedl to, can e: contool in itspreferable formas being equipped asesora action of the handles, willform hurra or 79 teeth on both laces vci the loop, whereby theelectrical conductivity of the nished joint is greatly improved, and theloop then can to some extent serve as a nut loch,.tendingA to tightlymaintain the electrical connecl5 tion under all ordinary conditions ofvibration.

Although ll have shown and described the with two opposin dies forforming u in'both sides of t e work-piece simultaneously, it issometimes desirable to provide burrs in one side only. ploy only onetoothed die and in lieu oi the op osite die may use a non-toothed die or99 a ixed anvil memher as a work-suporting means for the under side ofthe wor-piece, without( forming any teeth in one side of it. Suchconstruction of the tool is included in.

llii such event ll emthe scope ot certain of the clan;- and is e. ,tio

part ot my invention conside".z a i in its broader aspect. l i

Having thus described my invention, what l claim and desire ents is:

l.. lin a tool for fog hurrs ulei ously on the op osite f of a circularconnector the com ination of two dies fm alined, their opposin, endshaving progt= to sec hy Letters Pet-A w ing cutting teeth -Iularly agedand gli@ of ratchet shape, a oke hag two jaws spacedapart and i hodeways slidingly receiving the dies, said dies threaded in saidguideways, means for mi: said g 'dies about their axes simultaneouslyandY l.

equally in ppposite directions, centerin means engaging the work Irotation o the dies an during the r H i J u elli; 0f th teeth in thefaces of the work and holrxlfv g means ada ted to prevent angularmovement ll@ axes simultaneously an equally in o posits im directions, acentering plate fixed to and engaging `the loop of the wor guide memberalso iixed to the yoke or constraining the work against movement side--wisa i upstending hurra e yoke 3. Ina tool for forming on the oppositefaces of a terminal connector loo a yoke having two jaws sp .a

irovided with A dewa two dies axialandaV le in d deways, the nacopposing end faces of said dies having rojectin cutting teeth, a handlesecure to each ie for rotating said dies about their axessimultaneously, an equalizing mecha nism associated with said handlesfor constraining them to move equally in opposite directions, said diesand guidewaye being in threaded engagement adapted to cause the dies tomove toward and away from each other during their rotation, and a plateholding` the loop of the Work inv axially centered re ationship tothedies.

4. In a tool for formin outwardly projecting burrs in a face of aooped'connector, the combination of a yoke having a bored guideway, a.die slidingly reoeived in said guideway and having an annular series ofypro]eating cutting teeth in its end face, said die threaded in saidguidevvay, means for rotating the die about its axis and imparting to itan ular movement and simultaneous longitudinal movement toward the work,work-supporting means, and centering means arranged to engage the workduringl the rotation of the die and during the embedment of its teeth inthe face of the Work.`

in testimony whereof, I ax m signature.

'RICHARD T. H SKING'

